80 



obliquely transverse thin brownish green patches : umbilicus \vanting. 



Greatest breadth .885 inch; least breadth .765 inch; height 

 .5 inch. 



Helix candescens. Shell like H, invalida, but white or yel- 

 lowish white, with a line of clearer white along the periphery : spire 

 much less elevated, and more regularly convex; surface smooth, or 

 granulated on the last whorl, rarely granulated on the penult whorl : 

 suture well impressed : apei'ture as in H. invalida, but the lip and 

 teeth are more robust, and their external furrows are very long and 

 deep : umbilicus wanting. 



Greatest breadth .84 inch ; least breadth .74 inch ; height .43 inch. 



Helix Foremaniana. Shell ovoid, with a scarcely perceptible 

 obtuse angle on the periphery : white, w^ith a very pale horn-colored 

 epidermis : with line irregular striai of growth, and sometimes on the 

 lower side of the last whorl with inequidistant unequal concentric 

 strire : spire very much elevated, with very convex outlines : whorls 

 seven and one-half, quite convex, with a well impressed suture ; last 

 whorl very convex beneath to the centre, without any indentation in 

 the umbilical region : aperture obliquely lunate, wider below than 

 above ; within, a little below the middle of the right side, is a long 

 lamellar tooth, commencing abruptly in the bottom of the aperture, 

 and gz-adually diminishing in height to its termination a little within 

 the margin ; with a wide irregular tooth on the end of the columella : 

 labrum sharp : umbilicus wanting. This species is dedicated to my 

 friend Dr. E. Foreman, of Washington, who is well known for many 

 years to have rendered valuable services to Conchology. 



Greatest breadth .78 inch; least breadth .73 inch; height. 9 inch. 



Helix alveus. Shell scmioval, scarcely subangular on the pe- 

 riphery : whitish, translucent ; with' excessively fine unequal striiB of 

 growth : spire extremely convex, with a very deep suture ; last whorl 

 rather small : aperture small, subquadrangular : labrum sharp and 

 thin : labium with a distinct but not a thick deposit : umbilicus about 

 half as wide as the last whorl, scarcely contracted except quite near 

 the apex, where it consequently terminates very obtusely. 



Greatest breadth .3 inch ; least breadth .28 inch ; height .18 inch. 



Helix coLtrMELLATA. Shell convex-conic above, moderately con- 

 vex beVieath : white under a yellowish or greenish brown epidermis : 

 with fine irregular striae of growth ; sometimes with numerous micro>- 

 scopic punctures : apex subacute : spire very much elevated, nearly 

 conic : whorls nearly six, moderately convex, obtusely a little shoulder- 



